This is dimensional analysis . ( how many dozen eggs do you have if you have 4 eggs? )

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)